The discovery of high levels of ozone around Pinedale, Wyo., galvanized the energy industry.

Millions of dollars are being spent, company officials say, to cut emissions of volatile organic chemicals and nitrogen oxides — key ingredients in ozone pollution.

EnCana USA, one of the biggest operators, so far has spent $25 million, said company spokesman Doug Hock. The company has, for example, reduced the pressure in its gathering lines to cut the chance of flash emissions, went to 160 separator tanks from 326 and switched to cleaner drilling rigs.

Questar Gas Co., another large operator, has spent more than $80 million, said Paul Methany, the company’s Rocky Mountain region vice president.

Questar is using cleaner compressor engines and a liquid-collection system to cut fugitive emissions and is testing a new catalytic converter.

EnCana estimates it has cut volatile organic emissions to 3,000 tons a year from 6,000 tons. Nitrogen oxides are down to 400 pounds a year from 800 pounds.

Questar has achieved similar cuts, Methany said.

“The industry has been making a serious effort,” said David Finely, Wyoming Air Quality Division administrator.

The Denver Art Museum plans to funnel a $25 million one-time gift into the estimated $150 million budget for renovating its iconic North Building in time for the structure’s 50th anniversary in 2021, officials announced Thursday.